Atmospheric undulations, 29. Attractions of Telescopic work, 85. Auwers, Discoverer of a new star in 1860, 314. Bacon, Roger, Early hints on refracted rays, 3. Barnard, His cometary discoveries, 255. —— observes Brooks’s multiple Comet, 239. —— observes new stars in the Trapezium, 319. —— observes a new nebula in the Pleiades, 351. Beauty and brilliancy of Venus, 145, Belts of Sun-spots, 104, —— on Jupiter, 172. —— on Saturn, 198. —— on Uranus, 218. Berthon’s dynamometer, 50. Biela’s Comet, 238. Bigourdan observes a variable Nebula, 351. Binary Stars, 300. Birmingham discovers a new star in 1866, 314. Bond, G. P., discovers Crape-ring of Saturn, 202. Brahe’s, Tycho, new star of 1572, 312. Bright objects near the Sun, 107. Brightness and position of Jupiter, 170. Brooks on Comet-seeking, 253. —— on Occultation of Jupiter, 187. —— on Shower of telescopic Meteors, 272, 274. Brooks’s double Comet of 1889, 239. Brorsen’s Comet, 239. Browning and reflecting-telescopes, 60. Brunowski discovers a new star, 313. Burnham, Discoverer of double Stars, 31, 320. —— discovers a group of 18 new nebulæ, 341. ——, Measures of the companion to Sirius, 307. —— on the inutility of “stops,” 58. Calver compares light of reflectors and refractors, 37. ——, Maker of glass specula, 16, 17. Canal-shaped markings on Mars, 159. Canis Majoris α, 307. Cassegrain’s reflecting-telescope, 10. Cassini, Diameter of his object-glasses, 9. —— discovers four satellites and the divided ring of Saturn, 9. ——, Observations of Jupiter, 172. ——, —— of Saturn, 198. ——, —— of Venus, 147. Celestial Globe, 63. Centauri α, Diameter and distance, 299. Ceres, 168. Chambers on Coloured Stars, 316. —— on the intra-Mercurial Planet, 348. Chandler on Variable Stars, 350. Changes, Lunar, 120. —— on Jupiter, 182. —— on Mars, 163. —— on Saturn, 206. Charts of Mars, 158. Cheapness of Telescopes, 57. Choice of Telescopes, 38. Clark, Alvan, & Sons, make large object-glasses, 18. ——, discovers the companion to Sirius, 307. Cleaning lenses, 59. Clusters of Stars, 317. Coggia’s Comet of 1874, 233. Colour of Jupiter, 171. —— of Mars, 155. —— of Saturn, 195. —— of Uranus, 217. Colouring of the eclipsed Moon, 119. Colours of Stars, 315. Coma Berenices, 317.